Tip & How-To about Car Audio & Video
Regardless of your wattage rating on your sub woofer, sub woofers differ in only one way. You get an "Open Air" and a "Closed air" Sub woofer, That being said, you'll have to check on your magnet which one you have, to make the boxes for that particular sub woofer. If it is an "Open air" Sub woofer, you should see a hole with "wire mesh" or "metal grid" in the center, at the back of the magnet. If it is a "Closed air", the magnet will be solid with no hole whatsoever.
If it is a "Open air" sub, your boxes should always be sealed with silicone sealant, and no ports are to be cut in your box.
Regarding the "Closed air" sub woofers, you should have 2 ports cot in the corners of the boxes just below your sub on the face of the box, and the port sizes should be around 50mm in diameter. Get yourself some 50mm PVC drain piping to use as ports. Firstlycut yourself a 100mm piece and insert flush with the front of the box. Test your sound. then try a 150mm piecs and test again. You should start with a 100mm long piece in the one box and add 50mm increments to "tune" the port up to 250mm, depending on the frequency of bass you require. Carry on testing the sound on each increment until you find the sound you want, Then silicone the port to the box for permanent fixing.
On a 15 inch Sub woofer ranging between 80Hz and 100Hz, the ample box size required should be around 27 liters, meaning that you will end up with a box of 16 inches high, x 16 inches wide, x 16 inches deep. Or 400mm high, x 400mm wide, x 400mm deep.
Enjoy!
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